You can create an Engagement Custom Audience based on people who saw your video on Facebook or Instagram. These include videos delivered to feed, stories and other eligible placements on Facebook and Instagram.

To create an Engagement Custom Audience from video views:

1. Go to your Audiences.
2. Click the Create audience drop-down menu and select Custom Audience.
   Note: If you've never created an audience, you'll see a Create a Custom Audiences button – not a drop-down menu. Click this button to create the audience.
3. Click Engagement.
4. Click Video.
5. In the Engagement field, choose the type of content that you want to use to create your audience. For example, "People who viewed at least ten seconds of your video".
6. Click Choose videos.
7. In the window that appears, open the drop-down menu and select Campaign, Page or Instagram business profile.
   • Campaign: Use the search bar to find a campaign (active or inactive). Then, tick the boxes next to the video(s) that you want to use.
   • Page: Select a Facebook Page and tick the boxes next to the video(s) that you want to use.
   • Instagram business profile: Select an Instagram business profile and tick the boxes next to the video(s) that you want to use. You can choose multiple videos from multiple business profiles for one audience.
8. Click Confirm.
9. In the In the past field, enter the number of days hat people will remain in your audience after they engage with your video(s). People are removed from your audience after the set time period unless they engage with the video(s) again.
   For example, if you tell Facebook to go back 30 days and a person engaged 29 days ago, they'll be in your audience. However, if they fail to engage the next day, they'll be removed from the audience. Anyone new who engages within the time period you choose will be added to the audience. This means that the audience is constantly being refreshed, so you don't need to edit or create a new Engagement Custom Audience unless you want to change the time period or the type of engagement.
10. Add an audience name and description (optional).
11. Click Save.

When you finish, we'll start building your Engagement Custom Audience and notify you when it's ready. You can then use the audience when creating an ad. Learn more about using an Engagement Custom Audience in targeting.

* Nguồn: Facebook